EP0810072A2 - Sichtfenster für eine Sägeschutzhaube und Verfahren zu dessen Herstellung - Google Patents

Sichtfenster für eine Sägeschutzhaube und Verfahren zu dessen Herstellung Download PDF

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Publication number
EP0810072A2
EP0810072A2 EP97303592A EP97303592A EP0810072A2 EP 0810072 A2 EP0810072 A2 EP 0810072A2 EP 97303592 A EP97303592 A EP 97303592A EP 97303592 A EP97303592 A EP 97303592A EP 0810072 A2 EP0810072 A2 EP 0810072A2
Authority
EP
European Patent Office
Prior art keywords
peripheral edge
guard
plate
layer
window assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97303592A
Other languages
English (en)
French (fr)
Other versions
EP0810072A3 (de
Inventor
David C. Campbell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Black and Decker Inc
Original Assignee
Black and Decker Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Black and Decker Inc filed Critical Black and Decker Inc
Publication of EP0810072A2 publication Critical patent/EP0810072A2/de
Publication of EP0810072A3 publication Critical patent/EP0810072A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/74—Moulding material on a relatively small portion of the preformed part, e.g. outsert moulding
    • B29C70/76—Moulding on edges or extremities of the preformed part
    • B29C70/763—Moulding on edges or extremities of the preformed part the edges being disposed in a substantial flat plane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D59/00—Accessories specially designed for sawing machines or sawing devices
    • B23D59/001—Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade
    • B23D59/002—Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade for the position of the saw blade
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
    • B27G19/04—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws for manually-operated power-driven circular saws
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/828—With illuminating or viewing means for work

Definitions

  • the present invention relates to a viewing window for a power tool guard and, in particular, a viewing window which allows an operator to see a moving cutting tool of the power tool.
  • One of the problems associated with the use of hand-held power tools is properly aligning the cutting tool of the power tool so that the desired cut is achieved.
  • One particular type of power tool where this problem is especially prevalent is a hand-held circular saw.
  • an operator When using a hand-held circular saw, an operator will normally draw a line on the workpiece indicating the direction and pattern of cut.
  • Circular saws typically have an upper saw guard which encases an upper peripheral portion of the blade. This upper saw guard prevents the operator from seeing whether the blade itself is actually following the marked cut line. Therefore, problems arise when the user initially attempts to align the saw blade with the cut line and further continues as the user attempts to keep the blade tracking upon the cut line.
  • U.S. Patent No. 4,450,627 discloses a circular saw with a clear viewing window on the upper saw guard.
  • the structure disclosed in this patent suffers from various disadvantages. More specifically, the window is disclosed as being made of a transparent plastic material.
  • plastic materials typically are susceptible to being electrostatically charged such that dust particles are likely to be attracted to the plastic surface. Thus, dust particles generated during the sawing operation are attracted to the plastic window due to the window maintaining an electrostatic charge.
  • a further object of the present invention is to provide a window with improved longevity for covering the aperture formed in the guard even if impacted by projectiles generated by the cutting tool or by external impacts to the tool housings (such as accidental drops).
  • Yet another object of the invention is to provide a method for making a scratch-resistant and static-induced dust contamination resistant viewing window that is efficient and cost-effective.
  • the present invention provides a window assembly for a power tool, the power tool having a guard to shield a moving cutting tool, the window assembly adapted to be attached to the guard and to cover an aperture formed in the guard to allow an operator to view the cutting tool as it engages a workpiece, characterised in that the window assembly comprises: a glass plate having an upper surface, a lower surface and a peripheral edge and configured to generally cover the guard aperture; a plastic layer having a peripheral edge and positioned on the upper surface; and a frame adapted to be attached to the guard and engaging the peripheral edge of the glass plate and the peripheral edge of the plastic layer.
  • the present invention further provides a method of making a window assembly for a power tool, the power tool having a guard to shield a moving cutting tool, the window assembly adapted to be attached to the guard and to cover an aperture formed in the guard to allow an operator to view the cutting tool as it engages a workpiece, characterised in that the method comprises: positioning a plastic layer on the upper surface of a glass plate, the layer and the plate each having a peripheral edge and configured to generally cover the guard aperture; and moulding a frame to engage the layer peripheral edge and the plate peripheral edge, the frame adapted to be attached to the guard so that the combined layer and plate generally cover the guard aperture.
  • a power circular saw designated generally by the numeral 10 is shown.
  • Saw 10 has a motor 12 which is operably attached to a circular saw blade 14.
  • a power cord (not shown) supplies electrical power to motor 12.
  • the upper portion of blade 14 is surrounded by an upper saw guard 16.
  • Upper guard 16 is fixedly secured to motor 12.
  • the lower portion of blade 14 is surrounded by a lower saw guard 18.
  • Saw 10 further has a planar base 20 with an alignment notch 22.
  • Lower guard 18 exposes the lower portion of blade 14 in a manner that is well-known in the art. More specifically, the front edge of lower guard 18 engages the leading edge of a workpiece (not shown). As the saw passes further into a workpiece, lower guard 18 is rotated generally upwardly to expose the lower portion of the blade. Guard 18 is spring-loaded so that when saw 10 is disengaged from a workpiece, lower guard 18 returns to its lower blade covering position.
  • Upper guard 16 is provided with a clear viewing window assembly 26.
  • Window 26 allows the user of saw 10 to view blade 14 as it exits a workpiece, thereby allowing the user to initially align and maintain alignment along the desired cutting path of saw 10.
  • Window 26 can be mounted to guard 16 through a pivot arrangement 28 which allows upwardly pivoting of window 26 for cleaning of the interior surface of the window, as will be more fully described below.
  • Window assembly 26 is used to cover an aperture 30 formed in upper guard 16.
  • Window 26 has a generally rectangular glass plate 34 which is generally sized to cover aperture 30.
  • Plate 34 has a peripheral edge 36 which is comprised of a pair of width segments 38 and a pair of length segments 40.
  • Plate 34 also has an upper surface 42 which, when window 26 is positioned over aperture 30, generally faces the operator and a lower surface 44 which, when window 26 is in position, generally faces blade 14.
  • Plate 34 is preferably of a tempered glass type such that it has improved durability and resistance to breakage from projectiles being propelled through the cutting action of blade 14 moving through a workpiece or from external impacts to the tool housings.
  • plate 34 is shown as rectangular, other suitable shapes, such as an oval shape, could be used. Further, although plate 34 is shown as planar, it could also have a curved or arcuate shape.
  • Plastic layer 46 Positioned on upper surface 42 of plate 34 is a plastic layer or film 46.
  • Plastic layer 46 is also generally rectangular in shape and has a peripheral edge 48 comprised of a pair of width segments 50 and a pair of length segments 52.
  • Plastic layer 46 is preferably formed of a transparent film constructed from multiple layers of polyester bonded together with cross-grained orientation. Layer 46 can be attached to plate 34 by a suitable pressure-sensitive adhesive.
  • peripheral edge 48 of layer 46 extends outwardly a small distance beyond peripheral edge 36 of plate 34. This overhanging portion of layer 46 extends around the complete periphery of plate 34. The purpose of this overhang will be more fully described below.
  • a frame 54 engages the entire peripheral edges 36 and 48 of glass plate 34 and plastic layer 46, respectively. Peripheral edges 36 and 48 are received in a channel 56 formed by frame 54.
  • Frame 54 is generally rectangular in shape and extends a small distance inwardly over the upper surface of plastic layer 48 and inwardly a small distance over the lower surface of glass plate 34 as best shown in Figure 3. In this manner, peripheral edges 36 and 48 are firmly held by frame 54.
  • Frame 54 is preferably formed of a synthetic polymeric/copolymeric material and is substantially rigid. Frame 54 can be formed with apertures to allow attachment of the finished window assembly 26 to upper guard 16 via pivot arrangement 28. Frame 54 is also formed with a generally rectangular edge 58 which engages a portion 60 of guard 16 that forms aperture 30.
  • the window assembly 26 described above is advantageous over prior window structures for numerous reasons. More specifically, having glass plate 34 oriented such that its lower surface is exposed to dust and other debris generated by blade 14 significantly reduces the possibility of dust collecting upon the window and obstructing the view of the operator. Glass plate 34 resists static-induced dust contamination of the window. Further, if the window is wiped clean with a cleaning cloth, as can be done if window 26 is pivoted upwardly about pivot arrangement 28, the glass plate is less likely to be scratched than if the window was made completely of a plastic material. Thus, utilising the inner glass plate prevents marring or scratching of the window which would obstruct the view of the operator through the window, and thus hinder the effectiveness thereof.
  • Plastic layer 46 on upper surface 42 of plate 34 also offers great advantages.
  • the plastic layer of film can be inexpensively coloured or tinted to add diversity and styling to the window. Further, it is preferable to add a scratch-resistant coating to the upper surface of the layer. Additionally, if the glass should become broken or shattered due to contact with a projectile generated by blade 14 or due to external impact to the tool housing, layer 46 is designed to maintain the broken pieces of glass plate 34 within frame 32 due to the adhesive attachment of layer 46 with plate 34, thereby preventing aperture 30 from being exposed even if plate 34 becomes broken due to projectile or external impact damage.
  • frame 54 over the glass peripheral edge 36 and plastic peripheral edge 48 serves to provide a suitable mounting structure for the combined plate and layer. It also serves to ensure that layer 46 is maintained on plate 34 and to prevent the peeling of layer 46 off of plate 34.
  • Window 26 is manufactured by first cutting or forming glass plate 34 to the proper size and shape. To provide maximum durability, the glass plate is then either chemically or heat strengthened. A transparent plastic layer, preferably a polyester film, is then applied over the entire upper surface of the glass plate. The layer is attached to the glass plate with a pressure-sensitive adhesive. Layer 46 can be pre-cut to its shape prior to being applied to the plate 34, or can be cut to its desired shape after the layer has been applied to the plate. The plastic layer is formed such that its peripheral edge extends beyond the peripheral edge of the glass plate over the entire extent thereof or over the length of opposite edges. More specifically, the plastic layer is oversized so that its width segments and/or length segments extend outwardly beyond the width segments and/or length segments of the glass plate.
  • the combined glass plate and plastic layer is then positioned in a mould and a synthetic polymeric/copolymeric material is injection-molded into the mould cavity to form the peripheral frame.
  • the frame can also be injection-molded to have one or more pairs of apertures to allow connection to upper guard 16 via pivot arrangement 28.
  • This injection-moulding process allows frame 54 to overlap and engage peripheral edges 36 and 48 or plate 34 and layer 46, respectively.
  • the combined structure of the glass plate and plastic layer is securely held within the frame due to the hardening of the frame about the peripheral edges thereof.
  • the extension of the peripheral edge of the plastic layer outwardly from the peripheral edge of the glass plate aids in the orientation of the combined plate/layer structure within a mould cavity.
  • a person performing the manufacturing process can readily tell which surface is to be the upper surface of the window (the plastic layer) and which is to be the lower surface (the glass plate).
  • the possibility of the window being inverted with the plastic layer facing the blade of the saw is reduced.
  • Assembly 58 is generally the same as assembly 26, except that peripheral edge 48 of plastic layer 46 does not overlap peripheral edge 36 of glass plate 34. Window assembly 58 is manufactured according to the same methods as window assembly 26.
  • plastic layer 46 is formed integrally with frame 54 during the moulding process. More specifically, plastic layer 46 is formed at the same time as frame 54 through injection-moulding. As is apparent, at least the material from which plastic layer 46 is formed must be transparent in nature. Therefore, both frame 54 and plastic layer 46 can be transparent in nature. However, it may be desirable to mould frame 54 with a material having a pigment and mould plastic layer 46 with a transparent material or to form a textured surface on frame 54 and a smooth transparent surface on layer 46.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Securing Of Glass Panes Or The Like (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Sawing (AREA)
EP19970303592 1996-05-31 1997-05-27 Sichtfenster für eine Sägeschutzhaube und Verfahren zu dessen Herstellung Withdrawn EP0810072A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US655905 1984-09-28
US65590596A 1996-05-31 1996-05-31

Publications (2)

Publication Number Publication Date
EP0810072A2 true EP0810072A2 (de) 1997-12-03
EP0810072A3 EP0810072A3 (de) 1998-09-23

Family

ID=24630871

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970303592 Withdrawn EP0810072A3 (de) 1996-05-31 1997-05-27 Sichtfenster für eine Sägeschutzhaube und Verfahren zu dessen Herstellung

Country Status (4)

Country Link
US (1) US6276064B1 (de)
EP (1) EP0810072A3 (de)
CN (1) CN1066090C (de)
CA (1) CA2204088A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2340445A (en) * 1998-08-14 2000-02-23 Milwaukee Electric Tool Corp Circular saw allowing view of blade
USD489591S1 (en) 2002-10-01 2004-05-11 Milwaukee Electric Tool Corporation Circular saw

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD461695S1 (en) 2001-04-06 2002-08-20 Black & Decker Inc. Circular saw guard
US6543143B2 (en) * 2001-04-06 2003-04-08 Black & Decker Inc. Metal cutting circular saw with integral sight window
US20070180710A1 (en) * 2002-04-03 2007-08-09 Keith Moore Metal cutting circular saw with integral sight window
TWM258818U (en) * 2004-03-23 2005-03-11 Rexon Ind Corp Ltd Saw blade hood with lighting device
CA2551463A1 (en) * 2005-11-02 2007-05-02 David Spinato A portable cutting device with guiding guard
EP2108491B8 (de) * 2008-04-08 2012-09-26 Suva Kreissägen - Schutzhaube
US20110219628A1 (en) * 2010-03-11 2011-09-15 Ryan Harrison Power tool with debris collection assembly
US9610704B2 (en) 2012-12-11 2017-04-04 Robert Bosch Tool Corporation Circular saw blade guard with scratch-resistant panel
CN103962884A (zh) * 2014-04-16 2014-08-06 于法周 一种锯床保护装置
CN207189852U (zh) 2017-06-05 2018-04-06 米沃奇电动工具公司 台锯
CN108161114B (zh) * 2018-02-27 2023-05-23 南京工业职业技术学院 一种用于切割机的降噪装置
US10875109B1 (en) 2018-04-30 2020-12-29 Kreg Enterprises, Inc. Adaptive cutting system
WO2022109381A1 (en) 2020-11-23 2022-05-27 Milwaukee Electric Tool Corporation Track saw assembly
US12330225B2 (en) 2021-06-28 2025-06-17 Milwaukee Electric Tool Corporation Cut-off saw including forward and reverse blade rotation
US12465982B2 (en) 2022-02-24 2025-11-11 Techtronic Cordless Gp Track saw including plunge lockout mechanism
US12083613B2 (en) 2022-10-18 2024-09-10 Techtronic Cordless Gp Track saw including plunge lockout mechanism

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2340445A (en) * 1998-08-14 2000-02-23 Milwaukee Electric Tool Corp Circular saw allowing view of blade
US6301789B1 (en) 1998-08-14 2001-10-16 Milwaukee Electric Tool Corporation Circular saw
GB2340445B (en) * 1998-08-14 2003-07-02 Milwaukee Electric Tool Corp Improved circular saw
USD489591S1 (en) 2002-10-01 2004-05-11 Milwaukee Electric Tool Corporation Circular saw
USD489954S1 (en) 2002-10-01 2004-05-18 Milwaukee Electric Tool Corporation Latch of a circular saw

Also Published As

Publication number Publication date
CN1176868A (zh) 1998-03-25
EP0810072A3 (de) 1998-09-23
CN1066090C (zh) 2001-05-23
US6276064B1 (en) 2001-08-21
CA2204088A1 (en) 1997-11-30

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